UNIVERSITY OF WISCONSIN 
COLLEGE OF AGRICULTURE 
MADISON, 5WISCONSIN 
DEPARTMENT OF WILDLIFE MANAGEMENT                                424 UNIVERSITY
FARM PLACE 
;uy k a, 19ch 
Mr. David B. Cook 
Conservation Department                                    t . 
Albany 7, New York 
Dear Dave: 
I am glad to hear your results and transmit my 19    ata as follows: 
New Growth, 1914 
(Figures in parentheses are needle lengths) 
Date       Tree 1              Tree 2              Tree 3               
Remarks 
May 7      2*                  2J 1"               2J1             
Growth started about 
April 25 
May 13     3*                  3 3/4              3 
May 20     6.                  6                   6 
May 29     13 3/S              1140                12 1/8 
June 2     1s (1*)             19" (1")            16* (1 3/8)

June 14   23J (2)             21, (I-)           21 (2 3/8)       Prolopsis
on No. 3. 
All trees show buds. 
June 17    25"                 27"                 23" 
July 1     26a (3*) 6 buds     31" (3 5/8) 7 buds 23" (4,*) 5 buds

J&lY 5     26 (3*)             31* (3 3/14)        23J (4J) 
July 16    261 (4)             311 (14)            24 (5) 
My growing period was, as you will see from the figures, between 40 and 45
days- 
Last winter was exceptionally warm and dry, and many exposed pines were killed
or 
injured by windburn. In looking over thousands of trees, it was clear that
the 
total growth this year was rather poor compared with other years, after making

due allowance for the acceleration one expects in new trees. I think the
dry 
winter accounts for this. 
I have no objection to an interim report, but I would prefer at least three
years' 
data. If our main point is the comparative phenology of two localities, the

difference during two yeat might well be the result of chance. 
Yours sincerely, 
ae& 4P/ 
Aldo Leopold 
P.S. I am assuming that I may keep your 
curves. If I am mistaken, please let 
me know, and I will return them.